Publications (24)
Theoretical Priors and the Dark Energy Equation of State
Ido Ben-Dayan, Utkarsh Kumar
We revisit the theoretical priors used for inferring Dark Energy (DE) parameters. Any DE model must have some form of a tracker mechanism such that it behaved as matter or radiatio…
Probing The Early Universe Cosmology With NANOGrav: Possibilities and Limitations
Ido Ben-Dayan, Utkarsh Kumar, Udaykrishna Thattarampilly +1
A stochastic gravitational wave background is a prediction of a number of astrophysical and cosmological phenomena including early Universe Cosmology. Recently, the NANOGrav Collab…
Metric for Rotating object in Infrared Corrected Nonlocal Gravity Model
Utkarsh Kumar, Sukanta Panda, Avani Patel
Here, we derive the metric for the spacetime around rotating object for the gravity action having nonlocal correction of to the Einstein-Hilbert action. Starting wi…
Primordial Gravitational Wave Background as a Probe of the Primordial Black Holes
Utkarsh Kumar
We study the formation of primordial black holes (PBHs) from the collapse of density perturbations induced by primordial gravitational waves (PGWs). The PGWs' interpretation of the…
Spherically symmetric static solutions, newtonian potential and degrees of freedom of a Nonlocal action
Utkarsh Kumar, Sukanta Panda
Nonlocal terms in the Einstein Hilbert(EH) action appears as IR corrections in effective theory of quantum gravity. Here we have considered such an action keeping the terms which a…
Cosmological consequences of a dynamical dark matter in the light of DESI DR2 measurements
Abhijith Ajith, Utkarsh Kumar
Recent DESI results exhibit preference for a Null Energy Condition violating dynamical dark energy, with early phantom behaviour. We explore an alternative interpretation in which…